A dive computer, personal decompression computer or decompression meter is a device used by an underwater diver to measure the time and depth of a dive so that a safe ascent profile can be calculated and displayed so that the diver can avoid decompression sickness.
Kirk Scuba Gear sells two basic types of dive computers:
Independent – These computers are separate gauges that you wear on your wrist or as part of an instrument console.
Integrated – These computers integrate with your SPG and/or other instruments, such as an electronic compass. By also measuring your air supply, some models can estimate how much time your remaining air gives you based on your depth and how fast you’re breathing.